--- expect-5.43~/exp_main_tk.c	2003-08-01 03:27:20.000000000 +0900
+++ expect-5.43/exp_main_tk.c	2009-07-28 00:13:49.000000000 +0900
@@ -32,6 +32,7 @@
 static char sccsid[] = "@(#) tkAppInit.c 1.19 95/12/23 17:09:24";
 #endif /* not lint */
 
+#include <string.h>
 #include <ctype.h>
 
 #include "tk.h"